KR100856440B1 - EL sheet for Multi-light emitting and EL keypad using the same - Google Patents

Abstract

The present invention relates to an EL sheet for forming a multi-fluorescence layer and partially or sequentially lighted to each button of the keypad to be illuminated in various forms, and an EL keypad capable of driving the EL sheet. An EL sheet, comprising: a transparent conductive front electrode formed on a base substrate, and a fluorescent layer formed on the front electrode and separated into a plurality according to the position and shape of a key button of the keypad; A dielectric layer formed on the fluorescent layer; And a back electrode formed on the dielectric layer in plural numbers according to the shape of each fluorescence layer, wherein the fluorescence layers are separated and emit light.

The EL keypad includes an EL sheet having the above configuration, and a switching element respectively connected to the back electrode of the EL sheet; A microcomputer that controls the switching device; And an inverter for supplying power to the front electrode and the back electrode of the EL sheet under the control of the microcomputer.

Keypad, Backlight, EL Seat, Multi-Luminous, Half-Mirror

Description

EL sheet for multi-light emitting and EL keypad using same {EL sheet for Multi-light emitting and EL keypad using the same}

1 is a plan view showing the structure of an EL sheet according to the prior art;

2 is a cross-sectional view showing the structure of an EL sheet according to the prior art;

3 is a plan view showing the structure of an EL sheet according to an embodiment of the present invention;

4 is a plan view showing the structure of an EL sheet according to another embodiment of the present invention;

5 is a plan view showing the structure of an EL sheet according to another embodiment of the present invention;

6 is a cross-sectional view showing the structure of an EL sheet according to an embodiment of the present invention;

7 is a cross-sectional view showing the structure of a keypad integrated EL sheet according to an embodiment of the present invention;

8 is a cross-sectional view showing the structure of a keypad integrated EL sheet according to another embodiment of the present invention;

9 is a flowchart showing a manufacturing process of the EL sheet according to the embodiment of the present invention;

10 is a block diagram showing a light emitting structure of a keypad according to an embodiment of the present invention;

11 is a block diagram showing a light emitting structure of a keypad according to another embodiment of the present invention.

** Description of symbols for the main parts of the drawing **

10 EL sheet 11: base substrate

12 transparent front electrode 13 (13a to 13e): fluorescent layer

14: dielectric layer 15 (15a, 15b): back electrode

16: protective layer 20: keypad (half-mirror, opaque fabric)

21: key button 30: inverter

40: Microcomputer SW, SW1, SW2: Switching element

The present invention relates to an EL sheet and an EL keypad, and more particularly, a multi-fluorescence layer is formed, and the EL sheet and the EL sheet which can be illuminated in various forms by partially or sequentially emitting light to each button of the keypad can be driven. It is about EL keypad.

In general, the keypad is a switching device for signal generation used in an electronic device such as a mobile communication terminal or a remote control, and should have a separate backlight device for identifying keys such as numbers, letters, and icons at night or in a dark place.

Conventionally, as a keypad backlight device of a mobile communication terminal, a chip LED (Light Emitting Diode) is mounted on a printed circuit board of a mobile phone and a reflective film is installed on a metal dome sheet to diffuse light to the front so that the illumination of the keypad of a mobile phone or an electronic device is improved. It was constructed. However, since the LED is a point light source, it is reflected by a reflective film to illuminate by diffusing light only on the key top portion of the keypad. However, the LED has the advantage of identifying letters or numbers printed on the surface of the key button portion of the keypad. There is a problem of low visibility and high power consumption. In order to solve this problem, a backlight device of a keypad using an EL (Electroluminescent) sheet instead of an LED as a light source of a backlight of a mobile communication terminal has been developed.

As shown in FIG. 1, the EL sheet for the keypad is disposed on the entire surface of the keypad in the form of a film at the bottom of the keypad 20 to illuminate key buttons 21 such as numbers or letters formed on the keypad.

The general cross-sectional structure (A-A ') of such an EL sheet generally forms a transparent conductive film of an ITO-PET film in which ITO 12 is deposited on a PET film 11, as shown in FIG. The EL layer in which the phosphor layer 13, the dielectric layer 14, and the back electrode 15 are laminated on the film in the form of a sheet is sealed in the protective layer 16.

In the EL sheet having the above structure, when power is applied to the front electrode 12 and the back electrode 15 connected to the ITO, the fluorescent layer 13 is excited at the same time as a whole to emit light of a uniform surface light source.

However, such a conventional EL sheet for keypad has a single layer of fluorescent layer inside the sheet, and can only illuminate various key buttons composed of numbers, letters, icons, and function keys formed on the keypad at the same time. There is a problem that does not sufficiently represent the characteristics. In addition, the front electrode has a problem that the ITO is deposited on a base film using a PET film and the like cannot be manufactured in various shapes.

The present invention has been proposed to solve the above problems, by forming a front electrode on a variety of base substrates, and by forming a fluorescent layer in accordance with the pattern of the keypad, various features for numbers, letters, icons, function keys, etc. It is an object of the present invention to provide an EL sheet and a method of manufacturing the same, which can be separated to emit light so as to be sufficiently represented, and which can illuminate each key button in various shapes and colors using a color fluorescent layer.

It is another object of the present invention to provide an EL keypad which enables light of various colors to be simultaneously emitted, partial light emission or sequential light emission to various key buttons of a keypad using the EL sheet as described above.

In order to achieve the above object, the EL sheet of the present invention is a keypad backlight EL sheet, comprising: a transparent conductive front electrode formed on a base substrate; and a plurality of keys according to the position and shape of a key button of the keypad on the front electrode. A fluorescent layer formed separately from the dog; A dielectric layer formed on the fluorescent layer; And a rear electrode formed on the dielectric layer in plural numbers according to the shape of each fluorescence layer, wherein the fluorescence layers are separated and emit light.

In the above-described configuration, the EL sheet is formed by directly forming a front electrode on a half-mirror or an opaque fabric, or further laminating a half-mirror or an opaque fabric on the entire surface of the base film. It is characterized by.

In the above-described configuration, the fluorescent layer is formed in the shape of numbers, letters, icons required for the keypad, or characterized in that one or more pigments are mixed to form a variety of colors to form a color fluorescent layer.

In addition, the manufacturing method of the EL sheet of the present invention, the step of forming a transparent conductive front electrode by printing a transparent conductive ink on the base substrate; and separated into a plurality in accordance with the position and shape of the key button of the keypad on the front electrode Forming a fluorescent layer; Forming a dielectric layer on the fluorescent layer; Forming a back electrode on the dielectric layer, the back electrode being separated into a plurality of shapes of the respective fluorescent layers; And forming a protective layer on the back electrode to protect the device. Characterized in that comprises a.

In the above-described configuration, the EL sheet manufacturing method includes directly forming the front electrode on a half-mirror or an opaque fabric, or half-mirror or an opaque fabric on the front surface of the base film. It is characterized by further laminating.

In the above-described configuration, the fluorescent layer is formed in the shape of numbers, letters, icons required for the keypad, or mixed with one or more pigments to form a variety of colors to form a color fluorescent layer.

In addition, the EL keypad of the present invention includes: an EL sheet having the above configuration; and a switching element connected to the back electrode of the EL sheet, respectively; A microcomputer that controls the switching device; And an inverter for supplying power to the front electrode and the back electrode of the EL sheet under the control of the microcomputer.

In the above-described configuration, the microcomputer controls the switching element so that each fluorescent layer formed by separating a plurality of EL sheets into simultaneous light emission, partial light emission or sequential light emission.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a structure of an EL sheet according to an embodiment of the present invention, Figure 4 is a view showing a structure of an EL sheet according to another embodiment of the present invention, Figure 5 is another embodiment of the present invention Is a view showing the structure of an EL sheet according to the present invention.

Referring to FIG. 3, the EL sheet 10 according to the exemplary embodiment of the present invention does not illuminate the front of the keypad 20 as a whole, and has a key button formed with various function keys, numbers, letters, icons, etc. 21) It is configured to separate and illuminate separately.

In other words, a keypad commonly used in a mobile phone has a number / character button for transmitting a call or a text message and is separately formed on the same key button by being divided into left and right or up and down. In the EL sheet 10 for separately illuminating a number or letter with respect to the keypad 20 having such a structure, a fluorescent layer 13 formed on the EL sheet 10 has a keypad 20 in the EL sheet 10. Are formed separately according to the corresponding key button 21 of the, and the specific configuration of the EL sheet 10 will be described later.

In the EL sheet 10 according to the embodiment of the present invention, the fluorescent layer 13 is formed by being separated into the numeric part 13a and the character part 13b of the key button 21, as shown in the figure, thereby providing the same key button. It is also configured to separately illuminate numbers and letters.

In addition, referring to FIG. 4, the EL sheet 10 according to another embodiment of the present invention does not illuminate the front of the keypad 20 as a whole, and various function keys, numbers, letters, The key buttons 21, such as an icon and a function key, can be separated and separately illuminated (see 13c to 13e).

That is, the keypad of the mobile phone is composed of 12 number / character buttons, other icon keys, function keys, and the like together with various function key buttons. The EL sheet according to the embodiment of FIG. The key buttons can be separated and illuminated separately.

On the other hand, although not shown, with respect to the front of the keypad, the various icon keys, function keys, number / character key buttons are separately illuminated and separately, the numeric part and the character part for the numeric / character key buttons are also separated. Can be configured to illuminate separately.

In addition, referring to FIG. 5, the EL sheet 10 according to another embodiment of the present invention is formed in the shape of an icon of various shapes such as numbers, letters or various shapes in which the fluorescent layer 13 is directly used for the keypad as shown. . That is, the fluorescent layer 13 is formed to recognize the numbers, letters, icons, and the like formed on the various keypads 20 only by the light emission of the EL sheet 10 itself. In addition to a separate keypad 20 printed with numbers or letters, the key buttons may be directly laminated to a half-mirror or an opaque fabric, in which key buttons are not formed, thereby allowing a keypad to be manufactured more clearly and simply.

In FIGS. 3 to 5, only the structure of the EL sheet which separates and illuminates the number / letter and icon key buttons is described. However, in addition to the number / letter key button, various function key buttons formed on the keypad of the mobile phone are also provided. The EL sheet of the present invention will be applied to be able to separate and illuminate in shape.

6 is a view showing the cross-sectional structure (B-B ', C-C') of the EL sheet according to the embodiment of the present invention, respectively, for the sake of understanding, the lower side forms the front electrode and the upper side the fluorescent layer, the dielectric layer, and the rear surface. The electrode is shown in a stacked structure sequentially.

Referring to FIG. 6, in the EL sheet 10 according to the exemplary embodiment, a transparent conductive front electrode 12 is formed on a base substrate 11, and a fluorescent layer 13 is formed on the front electrode 12. Dielectric layer 14, back electrode 15, and protective layer 16 are formed, respectively.

In more detail, the base substrate 11 may be formed of a base film such as a PET film, a PEN film, a PC film, a CNT film, or may be made of a polymer synthetic rubber, a flexible polyurethane, a polyurethane film, or a silicone rubber. . In addition, a substrate on which a protective coating layer of urethane is formed may be used on the release film. In this case, the release film is removed after the front electrode or the protection layer is formed. In this case, when the CNT film is used as the base substrate 11, the CNT film may function as the front electrode at the same time, so that a separate front electrode 12 may not be formed, and the transparent conductive front surface is formed by using the base substrate 11. Detailed description of the process of forming the electrode will be described later.

The above-mentioned transparent conductive front electrode 12 is formed on the base substrate as described above to form the front electrode of the EL sheet. In the embodiment of the present invention, it is formed by printing the transparent conductive ink on the substrate 11. As the transparent conductive ink used here, ITO paste, a transparent conductive polymer, carbon nanotubes (CNT, Carbon Nano Tube) and the like may be used.

That is, ITO paste, transparent conductive polymer, carbon nanotube, etc. are printed on the various kinds of base substrates as described above by screen printing or paste printing to form a transparent conductive front electrode.

The fluorescent layer 13 is formed on the transparent conductive front electrode 12, and the fluorescent layer 13 according to the embodiment of the present invention is formed by being separated into a plurality, as in the embodiments of FIGS. 3 to 5. Numbers, letters, icons, etc. with respect to the key button 21 are formed separately, or are formed of a multi-structure (13a, 13b) separated into various shapes as shown so as to be separately illuminated according to each key button. .

On the other hand, the EL sheet according to the embodiment of the present invention may be composed of a color fluorescent layer mixed with a pigment in the phosphor to emit light in various colors. That is, as described above, each of the fluorescent layers of a multi-structure separated into a plurality of the same color is formed by different concentrations or formed of two or more different colors, so that each key button can be illuminated in various colors Can be. The multi-color fluorescent layer allows the user to more clearly recognize each mode state of the numeric and character modes, and when applied to the keypad, each key button may be illuminated in various colors according to its characteristics.

The dielectric layer 14 is formed on the separated multi-layered fluorescent layer 13, and the back electrode 15 is formed on the dielectric layer 14 again. The back electrode 15 is an electrode for emitting the fluorescent layer 13, and may be integrally formed as one electrode on the dielectric layer 14, but the multi-structure fluorescent layers 13a and 13b having the above structure may be formed. In order to emit light, it is preferable that the fluorescent layer 13 is formed of the multi-structure 15a, 15b of the same form. That is, in the EL sheet according to the embodiment of Figs. 3 to 5, the back electrode 15 is also a multi-layered fluorescent layer 13a, 13b in a multi-structure 15a, 15b, which is divided into a numeral portion, a character portion, an icon portion, and the like. Are formed on top of the dielectric layer at positions corresponding to

In addition, a protective layer 16 for protecting the device is formed on the rear electrode 15, and although not shown, an EMI shielding layer for preventing noise may be further formed on the protective layer 16.

The EL sheet having the above structure is formed by separating the fluorescent layer and the back electrode into a key button or a digit / letter portion, so that each key button or digit / letter portion can be separately illuminated when applied to a keypad.

7 and 8 show a keypad-integrated EL sheet according to an embodiment of the present invention.

As shown in FIG. 7, in the EL sheet having the above structure, the transparent conductive front electrode 12 can be formed directly on the half-mirror or the opaque fabric 20. That is, the half mirror or the opaque fabric 20 is used as the base substrate, and the front electrode 12, the fluorescent layer 13, the dielectric layer 14, the back electrode 15, etc., having the structure described above on the upper side thereof, It consists of a sequentially stacked structure. In this case, since the light is directly transmitted by the fluorescent layers 13a and 13b formed in various order or characters in front of the half mirror or the opaque fabric 20, the half mirror or the opaque fabric 20 itself functions as a base substrate. At the same time, it can function as a keypad.

In addition, as shown in FIG. 8, the half mirror or the opaque fabric 20 may be further laminated on the entire base substrate 11 of the EL sheet according to the embodiment of FIG. In this case, the light of the fluorescent layer that emits light in various shapes is directly transmitted to the front surface of the half mirror or the opaque fabric 20 so that the half mirror or the opaque fabric 20 may function as a keypad.

In the case of the keypad integrated EL sheet using a half mirror or an opaque fabric, if the backlight of the EL sheet does not operate, numbers or letters may not be recognized from the outside and may be recognized as a mirror or may be recognized as a unique color of the opaque fabric. When the backlight is operated, a fluorescent layer in the form of a number or letter is emitted to illuminate the display to be visible from the outside as a keypad. Here, the half-mirror is made of a thickness of 5㎛ 100㎛, the opaque fabric is composed of black opaque fabric or colored opaque fabric having a transmittance of 5 to 70%.

As described above, the half-mirror or opaque fabric 20 is formed by forming the fluorescent layer 13 and the back electrode 15 of the EL sheet in various numbers, letters, and icons directly required for the keypad, thereby forming a half-mirror. Or the opaque fabric can function directly as a keypad without a separate key button formed with numbers, letters, or icons.

9 is a flowchart showing a manufacturing process of the EL sheet according to the embodiment of the present invention.

Looking at the process of manufacturing the EL sheet having the structure as described above with reference to the drawings, first to prepare a base substrate (S11), by sequentially laminating a transparent conductive front electrode, fluorescent layer, dielectric layer, back electrode, protective layer thereon To manufacture (S12 to S16),

Here, the base substrate can be used in various kinds of films. In case of using PET, PEN or PC film as the base substrate, the base substrate can be easily applied to the keypad to be slimmed, to improve the click feeling, and to reduce the thickness of the EL sheet. Films with a thickness of 30 μm to 30 μm are used. However, the thin film may cause curling due to the film being twisted due to the process at a high temperature and high pressure. In order to prevent this, the same film having a thickness of 50 μm to 150 μm may be formed on the bottom of the PET, PEN or PC film. A base electrode having a multi-layer structure attached with the used auxiliary film is used, and a front electrode is formed thereon. In other words, by thickening the entire base substrate with the auxiliary film, it is possible to prevent the phenomenon of curling due to high temperature and high pressure. In this case, the auxiliary film is removed after the front electrode is formed or preferably after the protective layer is formed.

In addition, the front electrode can be formed on a base substrate using a polymer synthetic rubber or a flexible polyurethane, a polyurethane film, a silicone rubber, or the like.

In addition, the base substrate may be formed of a protective coating layer of a urethane material on the release film, in this case, after the front electrode is formed or after forming all the protective layer, the release film is removed.

As described above, a transparent conductive front electrode is formed thereon using various kinds of base substrates (S12). The front electrode forms a transparent conductive ink such as an ITO paste, a transparent conductive polymer, or carbon nanotubes (CNT) by screen printing or paste printing.

In addition, the fluorescent layer is printed on the transparent conductive front electrode using a screen printing technique (S13). The fluorescent layer according to the embodiment of the present invention has the shape of a key button as shown in FIGS. 3 to 5. According to it is formed in a multi-structure separated into a plurality in various shapes. Such a multi-layered fluorescent layer can be formed into a multi-structure having a desired shape by printing using different printing plates, respectively.

In addition, the fluorescent layer may be printed with a color fluorescent layer in which at least two or more pigments are mixed so that the EL sheet can display various colors. That is, each of the fluorescent layers 13a and 13b may be formed of two color fluorescent layers in order to separately color-code each key button or number / letter / icon.

A dielectric layer is formed on the fluorescent layer of this structure (S14), and a back electrode for emitting each of the fluorescent layers is formed again on the dielectric layer (S15). The rear electrode according to the embodiment of the present invention is preferably formed in a structure that is separated into a plurality of the same shape as the fluorescent layer in order to individually emit the fluorescent layer of the above structure. That is, the transparent conductive front electrode is used as a common electrode, and the rear electrode is formed into a plurality of channels according to each fluorescent layer, so that light emission can be partially or sequentially according to an external signal.

A protective layer may be formed on the back electrode layer to protect the device (S16), and although not shown, an EMI shielding layer for preventing noise may be further formed on the protective layer. Also, as described above, when the auxiliary film is laminated or the release film is laminated on the base substrate, the EL sheet is completed by removing it.

On the other hand, it is common to form the front electrode of the EL sheet on the base substrate, but it can also be formed directly on the half mirror or opaque fabric. That is, a half mirror or an opaque fabric may function as a base substrate, and a fluorescent layer, a dielectric layer, a back electrode, and the like may be formed in various shapes on the same as the above embodiment.

Further, the step of separately laminating a half mirror or an opaque fabric on the front surface of the base substrate of the EL sheet manufactured according to the embodiment of FIG. 9 may be further included.

10 and 11 are block diagrams illustrating a state in which an EL sheet according to an embodiment of the present invention is applied to a keypad, and FIG. 10 is a structure of a keypad capable of illuminating by separating a numeric part and a character part of a key button, and FIG. 11 is a structure of a keypad capable of illuminating a plurality of key buttons respectively.

Referring to FIG. 10, the keypad according to the embodiment of the present invention includes an inverter 30, switching elements SW1 and SW2, front electrodes 12, and back electrodes 15 to supply power to the EL sheet. Then, the EL sheet is configured to separately illuminate the numeric part and the character part of the key button.

More specifically, the inverter 30 is for applying power to the EL sheet according to an external signal. In general, the 'EL-' terminal is connected to the transparent conductive front electrode 12 of the EL sheet and the 'EL +' terminal. Is connected to the back electrode 15, and is configured such that the fluorescent layer therein emits light by both electrodes.

In the keypad according to the embodiment of the present invention, the transparent conductive front electrode 12 is used as a common electrode, and the back electrode 15 is used by being divided into a numeric part and a letter part. To this end, the 'EL +' terminal of the inverter is coupled with a switching element for switching the back electrode 15a of the numeric part and the back electrode 15b of the character part.

That is, as shown, the EL keypad according to the embodiment of the present invention uses an EL sheet having a structure as shown in FIG. 3, and uses a front electrode as a common electrode to drive such an EL sheet. In order to emit each of the fluorescent layers separated by two, two separate rear electrodes 15a and 15b are used according to the corresponding fluorescent layer, and the key buttons of the numbers or letters are separately illuminated by the switching elements connected to the inverter. It is configured to be.

When the power is connected to 'SW1' by the action of the switching element, the key button of the letter portion is illuminated, and when connected to 'SW2', the key button of the numeric portion is illuminated. In addition, the power supply may be configured to be connected to both the 'SW1' and 'SW2' to be illuminated at the same time, it may be configured to be illuminated by connecting them sequentially.

Referring to FIG. 11, the keypad according to the embodiment of the present invention includes an inverter 30, a microcomputer 40, a switching element SW, a front electrode 12, and a back electrode 15 to supply power to an EL sheet. The EL sheet is configured so that each key button of the keypad can be separately separated and illuminated respectively.

Specifically, the inverter 30 is for applying power to the EL sheet according to an external signal. In general, the 'EL-' terminal is connected to the front electrode 12 of the EL sheet, and the 'EL +' terminal is the rear electrode. Connected to (15), the internal fluorescent layer is configured to emit light by both electrodes.

In the embodiment of Fig. 11, an EL sheet having a structure as shown in Fig. 4 is used. In order to drive such an EL sheet, a transparent conductive front electrode 12 is used as a common electrode and is separated for each key button. In order to emit the fluorescent layer, the rear electrode 15 separated according to the corresponding fluorescent layer is used, and each corresponding key button is configured to be illuminated by the switching element SW connected to the inverter 30.

The switching device SW is controlled by the microcomputer 40. The microcomputer 40 outputs a control signal according to a user's key button selection. The control signal selectively switches the switching device SW. The key buttons selected for the two key buttons can be emitted.

In addition, the microcomputer 40 may be configured to control the switching elements to be switched in a relay manner by a preset program or the like so that a plurality of key buttons may be partially or sequentially emitted. Such a configuration is not shown in FIG. 5. Various applications can also be made for the EL sheet shown or a multi-fluorescence layer structure having another shape.

When the fluorescent layer of the EL sheet according to the embodiment of the present invention is formed of a color fluorescent layer capable of exhibiting various colors as described above, the EL keypad is partially or sequentially emitted under the control of the microcomputer and the switching element. In addition, it can show more various lighting effects.

On the other hand, the EL sheet and EL keypad having the above structure according to the embodiment of the present invention can be used not only for the keypad of the portable terminal as described above, but also for the backlight field to which the EL sheet is applicable, such as a notebook keypad and a remote controller.

Although the present invention has been described in detail through specific embodiments, the present invention is not limited to the above-described embodiments, and various changes may be made by those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention. It may be changed and implemented.

As described above, the EL sheet of the present invention can be separated and emit light so as to sufficiently display the features of numbers, letters, function keys, etc. by the multi-layered fluorescent layer. The front of the button or keypad can be illuminated in various shapes and colors.

In addition, the EL keypad of the present invention can exhibit various animation effects by causing the various key buttons of the keypad to emit light simultaneously, partially or sequentially in various shapes and colors.

Claims (12)

In the EL sheet for keypad backlight, A transparent conductive front electrode formed on the base substrate; and A fluorescent layer formed on the front electrode and separated into a plurality according to the position and shape of the key button of the keypad; A dielectric layer formed on the fluorescent layer; And Including; a plurality of rear electrode formed on the dielectric layer according to the shape of each fluorescent layer; The EL sheet for a keypad, characterized in that each of the fluorescent layers are configured to emit light. 2. The EL sheet of claim 1, wherein a front electrode is directly formed on a half-mirror or an opaque fabric, or a half-mirror or an opaque fabric is further laminated on the base substrate. EL sheet for keypad characterized in that. 2. The EL sheet for keypad according to claim 1, wherein the base substrate is made of a CNT film so that the CNT film forms a front electrode. The EL sheet for a keypad according to any one of claims 1 to 3, wherein the fluorescent layer is formed in the shape of numbers or letters required for the keypad. The EL sheet for a keypad according to any one of claims 1 to 3, wherein the fluorescent layer is formed of a color fluorescent layer by mixing one or more pigments so as to exhibit various colors. In the manufacturing method of the EL sheet for keypad backlights, Printing a transparent conductive ink on the base substrate to form a transparent conductive front electrode; and Forming a plurality of fluorescent layers separated on the front electrode according to the position and shape of the key button of the keypad; Forming a dielectric layer on the fluorescent layer; Forming a back electrode on the dielectric layer, the back electrode being separated into a plurality of shapes of the respective fluorescent layers; And Forming a protective layer on the back electrode to protect the device; EL sheet manufacturing method for a keypad comprising a. The method of claim 6, wherein the EL sheet manufacturing method comprises directly forming the front electrode on a half-mirror or opaque fabric, or half-mirror or opaque fabric on the front surface of the base substrate. The EL sheet manufacturing method for a keypad characterized by further laminating. 7. The method of manufacturing an EL sheet for a keypad according to claim 6, wherein the forming of the front electrode comprises using the CNT film as a base substrate so that the CNT film forms a front electrode. The method of manufacturing an EL sheet for a keypad according to any one of claims 6 to 8, wherein the fluorescent layer is formed in the shape of numbers or letters required for the keypad. The method of manufacturing an EL sheet for a keypad according to any one of claims 6 to 8, wherein the fluorescent layer is formed as a color fluorescent layer by mixing one or more pigments so as to exhibit various colors. In an EL keypad using an EL sheet, EL sheet composed of any one of claims 1 to 5; and Switching elements each connected to a back electrode of the EL sheet; A microcomputer that controls the switching device; And And an inverter for supplying power to the front electrode and the back electrode of the EL sheet under the control of the microcomputer. 10. The EL keypad according to claim 9, wherein the microcomputer controls the switching element so that each fluorescent layer formed by separating a plurality of EL sheets into simultaneous light emission, partial light emission, or sequential light emission.

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